A group of "covert protesters" attended a breakfast at Chicago's Union League Club Thursday morning, where Wisconsin Governor Scott Walker was giving a speech on budget reforms and the sometimes unpopular changes he has made in his state.

Union members and members Stand Up! Chicago and Occupy Chicago Labor Committee planned to meet outside of the Union League Club Thursday morning when the event kicked off. A group of protesters in suits, however, made their way inside the event and sat at a table. Their presence went unnoticed until just before Walker approached the microphone.

[The protesters were] mostly young – mid-20s to mid-40s. They used each other as "human megaphones" as they took turns lobbing complaints at Walker. They ended with the chant: "Union busting is disgusting."

Walker stood next to the podium as the emcee tried to get rid of them. First, he tried talking over the protesters, then shouting over them, then, clapping so no one could hear them. Finally [protesters] were ushered out while again chanting, "union busting is disgusting."

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According to Stand Up! Chicago, the 70 protesters who attended the breakfast comprised almost half the total number of attendees.

"It is an outrage and a shame that we sit at this fancy breakfast to listen to someone who has wreaked havoc on the lives of working families," the group said, according to a statement from Stand Up! Chicago. "Governor Walker has vilified unions and insulted the 99% who depend on living wages and adequate benefits to support their families, while on the payroll of the right wing billionaire Koch brothers.”

After the group left, Walker returned to the microphone and the remaining attendees gave him a standing ovation.

"No matter how loud you shout, the facts are the facts," Walker said to the laughing crowd. "The facts are, our reforms have worked."